Sources

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Sources are aggregated from all nine era coin data files and deduplicated at the institution level — all citations from the same database, auction house, or catalog are merged into a single entry. The citation count reflects how many individual coin records reference that source. Each source is also tagged with the eras in which it was consulted.

Sources without a public URL (print catalogs, scholarly books) are included but display as non-linked. To regenerate this list after a data update, run node build-sources.js from the project root. For full methodology, see Data Methodology.